Let’s connect

TYPO3

Custom TYPO3 websites, developed in Bielefeld, for companies that need more than just a basic website: multiple languages, complex permission structures, and a system that scales with you.

Abstrakter Farbverlauf in Grün und Blau
Sprachvarianten einer TYPO3-Website mit Übersetzungsstand

TYPO3 Agency

TYPO3 is the CMS for companies whose websites need to grow along with them. Multiple languages, multiple locations, hundreds of pages: TYPO3 provides the structure needed to handle all of this. And we have the experience to put it to good use.

Enterprise CMS without
Enterprise Complexity

Security that doesn't
rely on plugins

Planning Certainty Through
Long-Term Support

Mitarbeiter von seitenweise in der Pause in der Lounge

When TYPO3 Is the Right Choice

Not every project needs TYPO3. But if your website needs to support multiple languages or manage different locations under one roof, TYPO3 provides a more stable foundation. This also applies if your editorial team works with clearly defined roles and approval processes. We’ll give you honest advice on whether TYPO3 is the right fit for your project or if a leaner solution like WordPress would make more sense.

How Your Team Works with TYPO3

TYPO3 isn’t a system you can just install and let run on its own. But that’s exactly what makes it so powerful: editorial workflows, access rights, and site structures can be tailored precisely to the way you work. Your editorial team gets a backend that’s tailored to its tasks. No cluttered interface, no features that nobody needs.

Mitarbeiter von seitenweise bei der Arbeit am großen Monitor

From corporate websites to multisite portals to accessible relaunches: every page we develop with TYPO3 is tailored to your organization’s specific needs. The following examples show how companies use the system with our help.

Unternehmenswebsite auf einem Tablet

Company Websites

Complex corporate websites with a customized information architecture, well-thought-out design, and a backend tailored to the way your editorial team works.

Multisite-Installation mit mehreren Domains in einem TYPO3

Multisite Portals

Multiple websites, one installation: TYPO3 manages different brands, locations, or business units within a single system, with shared or separate content.

Übersetzungsstand einer mehrsprachigen Website

Multilingual Websites

TYPO3 was built with multilingual capabilities in mind. Translation workflows, language variants, and country-specific content can be managed directly within the system without the need for additional plugins or workarounds.

Logo von TYPO3

Career Pages

Career portals integrated with applicant tracking systems such as SAP SuccessFactors or Onlyfy. TYPO3 provides the structure for job postings, location pages, and employer branding content.

Ist-Analyse einer veralteten TYPO3-Installation mit Upgrade-Optionen

Relaunches

If your existing TYPO3 installation is outdated, we’ll analyze its current state. We’ll then advise you on whether an upgrade to the latest LTS version is sufficient or if a complete rebuild would make more sense. We’ll keep an eye on SEO metrics and redirect mappings throughout the process.

Barrierefreie Website mit Kontrasteinstellungen auf einem Tablet

Accessible Websites

The Act to Strengthen Accessibility (BFSG) has been in effect since June 2025. With the Bootstrap package, TYPO3 provides a solid foundation for WCAG 2.1-compliant websites: semantic HTML, correct markup, and a structure that works with screen readers.

These companies know how we work

TYPO3 offers over 5,500 extensions in its official repository, ranging from content elements and forms to complex workflow automations. If an existing extension doesn’t fit the bill, we develop our own: custom content elements, form logic with multi-step validation, or interfaces to third-party systems. Every extension is built to remain compatible with TYPO3 updates and to avoid creating technical debt. This means clean documentation, automated tests, and an architecture aligned with TYPO3 core conventions. When selecting existing extensions, we apply strict criteria: active maintenance, regular updates, and compatibility with the current LTS version. We check every extension for code quality and security before deployment. This ensures that your system remains maintainable, expandable, and free of legacy issues even years down the line. For each project, we decide on a case-by-case basis what a TYPO3 agency should develop in-house and what it’s better to purchase.

What Our Customers Say

„Working with an agency requires good ideas, cutting-edge technology, and clear budgets with no surprises. But the personal chemistry has to be right, too. With seitenweise, everything was just right. It was really fun.“

Logo von Intervideo

Mathias Schwaben

Intervideo

„What particularly impresses us about Seitenweise is not only its technical expertise, but also its proactive approach.“

Logo von DFT

Dirk Bockelmann

DFT

„I’ve worked with many digital agencies and seitenweise easily tops them all. They’re extremely accommodating and easy to work with. Their team seamlessly translates our objectives and requirements into impressive digital deliverables, always on schedule and within our budget.“

Hände tippen auf einem Laptop, daneben eine Kreditkarte

Locke Truong

TYPO3

„In addition to the entire team’s tremendous expertise, we especially appreciate how easy and quick it is to get in touch with them, even when things get urgent. Every problem, no matter how small, is taken seriously and resolved immediately.“

Logo von arcus physio

Julian Ellermann

arcus physio

Mitarbeiter von seitenweise am Arbeitsplatz Zwei Kollegen von seitenweise arbeiten gemeinsam am Laptop Kollege von seitenweise im Austausch mit dem Team Mitarbeiter von seitenweise entwickelt an einer Website

From the briefing to the go-live

Mitarbeiter von seitenweise am Arbeitsplatz
Zwei Kollegen von seitenweise arbeiten gemeinsam am Laptop
Kollege von seitenweise im Austausch mit dem Team
Mitarbeiter von seitenweise entwickelt an einer Website

Requirements and Concept

Together, we’ll clarify what your TYPO3 website needs to accomplish: target audiences, languages, roles, interfaces, and integrations. This will result in a concept that includes the page structure, navigation logic, and technical framework. During this phase, we’ll also determine which TYPO3 extensions to use and where custom development is needed. This ensures there are no surprises later in the project—neither in terms of technical requirements nor the budget.

Design and Prototype

We develop the visual design based on the concept. You’ll see drafts for the most important page types, provide feedback, and we’ll refine the design until we reach the final result. From the very beginning, we take into account how the design will be implemented in the TYPO3 backend. Which elements can your editorial team create on their own later on, and where do fixed structures make more sense?

Development and CMS Configuration

We implement the design using clean code and configure TYPO3 so that your editorial team can work with clear workflows and permissions. This includes custom content elements, page templates, access rights, and approval processes. If needed, we develop custom extensions or integrate third-party systems via APIs. Every component is documented and designed for maintainability.

Testing and Launch

Before the site goes live, we’ll test the following in a staging environment: features, performance, responsiveness, and accessibility. Your editorial team will receive an introduction to the backend and can enter initial content on their own. Once everything is ready and you give the green light, the site goes live. After that, we’ll continue to be available—whether for maintenance, enhancements, or new requirements.

Frequently
Asked
Questions

Complex

Operable

Kollege stellt dem Team ein Projekt im Besprechungsraum vor

We bring structure to large-scale events.

seitenweise is a digital agency based in Bielefeld, founded in 1999. With over 100 clients and more than 500 projects, we’ve proven that we build long-term partnerships, not just take on individual projects. Our focus with TYPO3 is on corporate websites that are complex in structure but easy to use. We develop TYPO3 projects for companies in the East Westphalia-Lippe region and throughout Germany. We also offer strategy, UX/UI design, web development, SEO, and video—all from a single source. That means: streamlined communication, honest advice, and a team that knows your project from the very beginning—not just the ticket number.

Portrait von Marcel Pietsch vor einer Holzlamellenwand

Marcel and André are your points of contact at seitenweise. They'll be happy to answer any questions you have about TYPO3.

Portrait von André Schwarzer vor einer Holzlamellenwand

Whether it's a new TYPO3 website, an upgrade, or an extension to your existing installation: tell us where you stand and what you're planning. No obligation—it'll take just 30 minutes.

Let's go!